Other (Charges) Gains, Net (Schedule of Restructuring Reserves) (Details) - Employee Termination Benefits [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	$ 63	$ 18
Additions	68	106
Cash payments	(102)	(55)
Other changes	0	(3)
Exchange rate changes	2	(3)
Reserve as of the end of the period	$ 31	$ 63
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	Other Nonrecurring (Income) Expense	Other Nonrecurring (Income) Expense
Engineered Materials
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	$ 57	$ 13
Additions	39	89
Cash payments	(80)	(40)
Other changes	(4)	(2)
Exchange rate changes	2	(3)
Reserve as of the end of the period	14	57
Acetyl Chain
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	0	2
Additions	11	1
Cash payments	(2)	(2)
Other changes	0	(1)
Exchange rate changes	0	0
Reserve as of the end of the period	9	0
Other [Member]
Restructuring Reserve [Roll Forward]
Reserve as of the beginning of the period	6	3
Additions	18	16
Cash payments	(20)	(13)
Other changes	4	0
Exchange rate changes	0	0
Reserve as of the end of the period	$ 8	$ 6